| 摘要 |
PURPOSE:To improve the space factor or the like by connecting a slave microcomputer and a master microcomputer provided for each master transmitter- receiver unit through a serial port, and applying interruption from the former to the latter, thereby sending/receiving a data. CONSTITUTION:A microcomputer 24 is provided with a parallel port 247 to interrupt an output and a serial port 248 for the data transmission reception. Furthermore, a serial port 258 for data transmission reception is provided to a microcomputer 25A. Moreover, microcomputers 25B, 25C are constitute similarly. Then interruption is applied from the microcomputer 24 to microcomputers 25A-25C to request the access of a command CCMD, which access the microcomputer 24 and the microcomputers 25A-25C serially. Thus, 6 signal lines have only to be provided between the microcomputer 24 and the microcomputers 25A-25C, and the packaging space is remarkably decreased. |
